Safety device for bolt-heading machines.



No. 690,919. Patented .!an. 14, I902.

.1. R. BLAKESLEE.

SAFETY DEVICE FOR BDLT HEADING MACHINES.

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No. 690,9l9. Patented Jan. I4, 1902. J. R. BLAKESLEE.

SAFETY DEVICE FOR BOLT HEADING MACHINES.

(Application filed May 25, 1901.] (No Model.)

3 Sheets-Sheet 2.

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Patented Ban. l4, I902.

J. R. BLAKESLEE.

SAFETY DEVICE FOR BOLT HEADING MACHINES.

(Application filed May 25, 1901.)

3 Sheets-Sheet 3.

(No Model.)

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JOHN R. BLAKESLEE, OF GLENVILLE, OHIO.

SAFETY DEVICE FOR BOLT-HEADENG MACHINES.

$PEGIFIGATION forming part of Letters Patent No. 690,919, dated January 14, 1902.

Serial No. 61,820. (No model.)

To all whom it may concern:

Be it known that I, JOHN R. BLAKESLEE, a citizen of the United States, and a resident of Glenville, county of Ouyahoga, and State of Ohio, have invented a new and useful Improvement in Safety Devices for Bolt-Headin g Machines, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

My invention relates to devices for preventinginjury or breakage of parts of metal-working machines, such as bolt-headers, wherein are used reciprocating forming tools or dies, the clogging or obstruction of which would result in serious injury, and constitutes an improvement upon the invention shown and described in Letters Patent No. 648,383, issued to me May 1, 1900. Saidinvention consists of means hereinafter fully described, and pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings, Figure I represents a plan View of a part of a bolt-heading machine to which my said invention is illustrated as being applied, showing a top plate broken away to show the connections between the reciprocating die and the actuating-pitman. Fig. II represents a side elevation of the invention detached from the machine, showing a portion broken away to illustrate theinteriorconstruction. Fig. III represents an end elevation of same. Fig. IV represents a side elevation illustrating a second position of parts thereof, and Fig. V represents a similar View illustrating a third position of such parts.

The pitman A, connected with the crank 13, and which operates the reciprocable die 0 through the medium of the levers D and D and links D and D is provided with a yielding member, which consists of a piston a and rod 11, the outer end of such rod being connected with lever D by means of a balland-socket joint d, Fig. I, the piston being adapted to reciprocate in a bore a Fig. II,

formed in the pitman. Upon the top of the pitman is formed a spring-casing a having abore a, in which is located a helical spring E, surrounding the stem of a bolt F, the end of which stem is provided with a thread and nut and projects beyond the end of said casing through a suitable opening. The head 6 of said bolt projects from bore a from the opposite end of said casing and is outwardly urged by said spring, which is confined between said head andcasing, as shown. Such outward movement is limited and determined by the nut, as will be readily understood. Intermediate] y of said spring-actuated bolt and the piston end of said yielding member are pivoted two locking-levers G and G, the upper end of the one, G, being adapted to engage the bolt-head and the upper end of the otherbeing adapted to engage said piston. Lever G is provided with ashoulder g, which the contiguous end of lever G is adapted to engage, as shown in said Fig. II. The location of lever G with respect to bolt F is such that when lever G"engages lever G the spring E will have assumed a normal state of compression, the bolt-head being urged against the end of said lever G, thereby maintaining the engagement of lever G with shoulder g. The two levers are compounded, as shown, and designed so as to permit of the use of a spring of moderate size as compared with that used in the device shown and described in said above-mentioned Letters Patent and at the same time require a comparatively large amount of power to compress same by application of pressure to the upper end of lever G, entailing thereby only a small amount of compression of the spring.

During the normal operation of the machine the levers, bolt, and yielding member are caused to engage and are located as shown in Fig. 11, whereby the said yielding member is fixed relatively to the pitman. Upon encounteringan abnormal obstruction thereciprocating die is caused thereby to work against an increased pressure, and is either stopped completely or is retarded upon the pressure of theyielding member and becomes sufficient to compress spring E and cause lever G to become disengaged from lever G, as shown in Fig. V, bot-11 levers dropping into the position shown in Fig. IV. This action permits the member A to yield and recede into the bore a ,thereby relieving the stress upon the parts, preventing breaking thereof or damage thereto, while permitting the operating-crank to continue its motion. When it is desired to effect a rengagement of the parts, the spring is compressed by drawing up the bolt by means of the nut; as shown in Fig. V in dotted lines, thereby drawing back the bolt-head a distance sufficient to permit the locking-levers to engage one another. These lovers are held in such engaging position until the bolt has been released by screwing the nut back to permit the head to again engage the upper end of lever G, and thereby maintain such engagement as before.

Other modes of applying the principle of my invention maybe employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any one of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention- 1. In a safety device for bolt-heading machines, the combination of a pitman provided with a yielding member, a spring-actuated member, and two levers intermediate of said yielding and said springactuated members, such latter two members adapted to engage respectively, each of such levers, the latter adapted to operatively engage each other,and said spring-actuated member adapted to efiect and maintain such engagement.

2. In a safety device for bolt-heading machines, the combination of a pitman provided with a yielding member, a spring-actuated bolt, two levers fulcrumed upon said pitman, the one lever adapted to engage said bolt and 0 the other said yielding member, and adapted to engage one another in a manner such as to fix said yielding member relatively to the pitman, said bolt adapted to maintain such engagement of said levers.

3. In a safety device for bolt-heading machines, the combination of a pitman provided with a yielding member, a spring-actuated bolt, two levers fulcrumed upon said pitman, the one lever adapted to engage said bolt and 50 the other said yielding member, the one lever provided with a shoulder and the other adapted to engage such shoulder, said spring-actuated bolt adapted to maintain such engagement of said levers with each other and of 55 said lever with said yielding member,whereby the latter may be fixed relatively to said pitman.

Signed by me this 2d day of May, 1901.

JOHN R. BLAKESLEE.

Attest:

D. T. DAVIES, A. E. MERKEL. 

